The OVATION Model: The Engine Behind the Aurora Forecast Maps You Use Every Night

When you open an aurora app and see a shaded oval on a global map showing where the northern lights are predicted to appear, that map almost certainly draws on one model: OVATION. Developed at the Johns Hopkins University Applied Physics Laboratory and adopted by NOAA as the basis for its operational aurora forecasts, OVATION is the most widely used aurora prediction tool in the world — and understanding how it works helps you use its output more intelligently.

What the OVATION Model Is

OVATION — the Oval Variation, Assessment, Tracking, Intensity, and Online Nowcasting model — is an empirical model that predicts aurora location and intensity based on real-time solar wind measurements from satellites at the L1 Lagrange point, primarily the DSCOVR satellite. It uses a statistical database of historical relationships between solar wind conditions and observed aurora to predict where aurora is likely to be occurring right now and in the next 30 to 90 minutes.

What helped me picture how empirical models work: OVATION isn't running a physics simulation of the magnetosphere in real time. Instead, it's asking: given these solar wind conditions — this Bz, this solar wind speed, this density — what did aurora look like historically when conditions were similar? The answer, derived from a large database of satellite observations, produces a statistical prediction of where the oval sits and how intense aurora is likely to be at each location beneath it.

What OVATION Predicts — and What It Doesn't

OVATION produces two main outputs: a map of predicted aurora oval position and a color-coded intensity forecast showing energy flux across the oval's width. These are the maps you see in most aurora apps — the ones showing the oval sweeping across northern latitudes with color gradients from green to red indicating intensity.

What OVATION does not predict is substorm activity specifically. Because substorms are localized, short-duration events driven by magnetotail reconnection, they don't fit neatly into the statistical framework that OVATION uses. A night where OVATION shows moderate activity may include one or more intense substorm cycles that produce far more dramatic aurora than the map suggests. OVATION gives you the baseline expectation; the real-time Bz and local magnetometer data tells you whether a substorm is developing on top of that baseline.

What OVATION Means for Aurora Travelers

The OVATION map is most useful as a 30-minute horizon forecast — it tells you where the oval is likely to be right now based on current solar wind conditions, with reasonable accuracy for that short window. Beyond 30–60 minutes, uncertainty grows considerably, and the 3-day NOAA forecast that some apps display is based on different, less precise modeling than the OVATION nowcast.

For travelers deciding whether to go outside on a given night, the OVATION map is a useful starting check. If it shows the oval positioned directly over your location with moderate to high intensity, conditions are favorable. If it shows the oval well north or south of your position, activity at your location is likely to be limited regardless of what the Kp index shows. Combined with real-time Bz data, OVATION gives a more complete picture than either source alone. Our Northern Lights Tour in Fairbanks guides use OVATION alongside real-time solar wind data when making nightly field decisions.

What OVATION Means for Photographers

For photographers, the OVATION map helps with positioning decisions when multiple shooting locations are available. If the oval is predicted to sit slightly north or south of your planned location, moving a few kilometers in the corresponding direction can make a meaningful difference in what appears overhead. During elevated Kp events when the oval expands, the OVATION map updates to reflect the expansion — helping photographers identify whether they're positioned within the most active zone or on its margins.

The intensity gradient the model produces — showing brighter predicted aurora toward the oval's center — is also useful for anticipating color. Higher-intensity zones are more likely to produce the elevated-energy electron precipitation that creates red and blue-purple aurora alongside the baseline green. Positioning within the high-intensity center of the predicted oval, rather than its edges, maximizes the probability of capturing the full color spectrum.

Return to the full Northern Lights Glossary to continue through the Forecasting and Observation Tools section.